Lubricating tubular drill.



No. 841,184. PATENTED JAN, 15, 1907. W. B. ROBSKE.

-- LUBRICATING TUBULAR DRILL.

APPLICATION FILED NOV. 27, 1905 J'NVENTOR UPZ'I2IYES5LES: (Z

UNITED STATES PATENT orrroE. WILLIAM E. ROESKE, or DAVENPORT, IOWA.

' LUBRICIATINDG TUBULAR DRILL. i

'No. 841,184. V

Specification of Letters Patent.

. Patented. Jan. 15, 1907.

Application filed November 27,1905. Serial No. 229.271,

' rd whom it-maly concern:

Be it known that I, WILLIAM E. Ronsnn, a citlzen oftheUnit-ed'states, residing at Davenport, in the county of Scott and State of Iowa, have invented certainnew and useful Improvements in Lubricating Tubular Drills,

' of which the following is a specification.

- The invention relates to those a tubular drills that have internal passa es through which lubricating material may e forced to the cutting-lips for washing out'the chips and conductmg away the heatlncident to drilling and for otherwise aiding the cutting action of the drill and prolonging its life.

This invention further relates'to a drillingtool of such structural organization as Will be better qualified for resisting torsional stress than ordinary tools of this class and one through which the oil forced to the cuttingpoint may be delivered under high pressure without liability of leakage.

My invention conslsts malnly in the construction of the cuttinger of the drill, the

- conformation of the longitudinal oil-cavity,

an end view of the drill-point. side view with the peripheral fluting downward, showing the bevel of the cutting edge in the curvature of the peripherally-gooved .fiuting, in the steel bridge reinforcing the and its disposition with reference to the peripheral fiuting. Fig. 3 is another side view of the drill-point as seen when rotated a quar- I Fig. 2. .40

l beyond the position shown ig. 3.

is a side view still further revolved, showing ter-revolut1on beyond the position shown in Fig; l-is another side view of the drlll-point when rotated a quarter-revolution Fig. 5

the ofiset or bevel E on that portion of the extremity of said drill-point a scent to the cutting-lip on the convex cylindrical element :Fig. 6 is a longitudinalsection of the assembled drill point and shank. Fig. 7 isa longitudinal view of the drill and shank, showing the peripheral iluting.

In the process of making a drill which embodies the invention a steel tube F of circular cross-section formed to approximately the diameter and length of thecornpleted drillpoint may be out throughout its length by two longitudinal cuttings at distances of ap- '--.proximately one hundred "ad twenty de-" by the. drills rotation.

grees of the cylindrical circumference and so much of the tube asis included in said are between said longitudinal, uttings removed, another steel tube G of less diameter'than fthe first, divided-by two longitudinal cuttings interce tin an arc of more than a hun-,

dred and eig ty egrees of horizontal circumference. The. two cylindrical. sectors thus formed are regarded as joined in such a manher that their horizontal cross-section is a lune, as shown in Fig. 1 and both arcs of said lune, F and G, are supported at their middle points B and D by the steel bridge H, which bridge does not necessarily extend through:

out the entire length of the drill-point, as it is designed primarily to give stability to the cutting-lip K. The peculiar shape. of this drill may also be formed by properly molding or compressing the wall of a single cylinder until the condltions described have been obtainedfthus forming a hollow drill of lunar c oss-section, with a longitudinal peripheral groove, as described.

The smaller arc L of the lunarcrosssection" referred to is at its middle point approxi mately at the center of the circle described by the radius of the larger arc of the'lune, and in a horizontal cross-section of the drill taken at the edge of the cutting-lip or slightly above it the radius of the drill forms a chord with the cutting-lip, which lip is in line with a perpendicular to the longitudinal axis of the drill, by which arrangement the cuttinglip is within the radius of a circle described The cutting-lip K is ground in plane passing obliquely through a diameter of the drill, as shown at M, which method of. grinding provides free access by l the cutting-lip to the metal worked upon, as

the edges M and K are in a plane having an inclination of less than ninety degrees to the longitudinal axis U T. The cutting-lip K is the first half of the concave lunar are L above referred to. The remaining part of said, concave arc is shown at E, which together with the cutting-lip K constitute the arc of fluted periphery; but so much of said are E as lies between the longitudinal axis U T, bein onehalf of the arc of fluted periphery an continuous with the cutting-lip K and the circumference of the outer cylindrical element F, is cut by aplane passing through the radius of the drill-cylinder B D, said radius B D IIO dius nearly coincident with the cuttingdip K, and the plane of grinding in this part of the drill-point is at an angle of, less than ninety degrees to the longitudinal axis U T, by

which means a triangular space U N O is left between this part of the drill-points extremity on both interior and exterior cylindrica'l segments and the material worked upon, permitting free application of the lu-j bricant from the interior of the drill.

The union of the drill-point with the shank or stem is accomplished as shown in Fig. 7.

A conical ta or on that endof the drill-point P is receive in a conicalopening R in the drill stock or shank S, and on' both the male andfemale elements of this conical joint are turned-grooves V, which precisely overlap are filled with a composition metal meltin at .a low temperature, by which means the rill when the drill is assembled. The grooves fluting formed by the im osition of the smaller cylindrical e'leinen G, connected concavely to the larger cylindrical element F, ailords an avenue for washing out the chips produced in drilling.

Oil is applied. atthe head of the drill under high pressure and is conveyed to the cutting edge or lip of the drill through the open space formed in the interior of the'drill by means of the junction. of the two cylindrical elements as described above.

ing' through the arc of fiuting.

MLRM

Having thus described my invention,

1 claim 4 1. A metal-boring drill composed of the union of two cylindrical sectors, having an interior opening of lunar cross-section hounded by said sectors, and at its extremity it cutting-lip on the edge of one of the cylindrical sectors.

' 2. A hollow metal-boring drill of lunar cross-section having alongitudinal peripheral fiuting, one half of the are at the extremity of said fluting being disposed at right angles to the longitudinal axis of the drill and the other h ilfiof said fiuting being cut by a plane passing through the transverse diameter perpendicular to the chord of the minor arc of the lune at an-angle of less than ninety degrees, thedrill being also cut by a plane passingat an angle of less than ninety degrees to the longitudinal axis of the drill ass- 3. A hollow metal-boring drill with a longitudinal peripheral fluting, formedby the H rigid union of two cylindrical segments of uniirst-mentioned half 0 the equal diameters and provided with a cuttinglip and a flat steel bridge radially interposed between the extremity of the cylindrical seg:

ments. v l

In testimon that I claim the foregoing as my invention have signed my name, in the presence of two witnesses, this 7th day of November, 1905.

3 WILLIAM E. RoEsKE.-

Witnesses:

J A. HANLEY', E. L. Gunw 

